Just a small tray that folds up and simply slides between slats of my fence. I ran a small 3/8" dowel through the hinge - it's pretty tight, but I just chucked it up in my drill and ran it through the hinge that way.
I originally printed this in brown PLA, but that just melted in the sun! 🤣 Was pretty sad and droopy after just a few days. This PETG one has held up nicely for a year and a half now.
Original model available at https://cad.onshape.com/documents/5066da789e18c99f8eaca4b4/w/92096357271c29f88b159612/e/63caf3c3f63278dc195f6b9a?renderMode=0&uiState=69167fe7cf1a491559620dd3
The author marked this model as their own original creation.